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LTC6605-14 Datasheet, PDF (1/20 Pages) Linear Technology – Dual Matched 14MHz Filter with Low Noise, Low Distortion Differential Amplifi er | |||
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LTC6605-14
Dual Matched 14MHz Filter
with Low Noise, Low Distortion
Differential Ampliï¬er
FEATURES
DESCRIPTION
n Two Matched 14MHz 2nd Order Lowpass Filters
with Differential Ampliï¬ers
Gain Match: ±0.25dB Max, Passband
Phase Match: ±1.1° Max, Passband
Single-Ended or Differential Inputs
n < â84dBc Distortion in Passband
n 2.1nV/âHz Op Amp Noise Density
n Pin-Selectable Gain (0dB/6dB/9.5dB)
n Pin-Selectable Power Consumption (0.35mA/
16.2mA/33.1mA)
n Rail-to-Rail Output Swing
Adjustable Output Common Mode Voltage Control
Buffered, Low Impedance Outputs
n 2.7V to 5.25V Supply Voltage
n Small 22-Pin 6mm à 3mm à 0.75mm DFN Package
APPLICATIONS
n Broadband Wireless ADC Driver/Filter
n Antialiasing Filter
n Single-Ended to Differential Conversion
n DAC Smoothing Filter
n Zero-IF Direct Conversion Receivers
The LTC®6605-14 contains two independent, fully differ-
ential ampliï¬ers conï¬gured as matched 2nd order 14MHz
lowpass ï¬lters. The fâ3dB of the ï¬lters is adjustable in the
range of 12.4MHz to 20MHz and 25MHz.
The internal op amps are fully differential, feature very
low noise and distortion, and are compatible with 16-bit
dynamic range systems. The inputs can accept single-
ended or differential signals. An input pin is provided
for each ampliï¬er to set the common mode level of the
differential outputs.
Internal laser-trimmed resistors and capacitors determine
a precise, very well matched (in gain and phase) 14MHz
2nd order ï¬lter response. A single optional external re-
sistor per channel can tailor the frequency response for
each ampliï¬er.
Three-state BIAS pins determine each ampliï¬erâs power
consumption, allowing a choice between shutdown, me-
dium power or full power.
The LTC6605-14 is available in a compact 6mm à 3mm
22-pin leadless DFN package and operates over a â40°C
to 85°C temperature range.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Dual, Matched 12.4MHz Lowpass Filter
+
VINA 3V
â
+
VINB 3V
â
1
2+
3
4â
5
6
LTC6605-14
7
8+
9
10 â
11
22
21
3V
0.1μF
20
0.1μF
19
18
17
16
15
3V
0.1μF
14
0.1μF
13
12
660514 TA01
â
VOUTA
+
â
VOUTB
+
Channel to Channel Phase Matching
160
354 TYPICAL UNITS
140 TA = 25°
fIN = 14MHz
120
100
80
60
40
20
0
â1.0
â0.6 â0.2 0 0.2 0.6 1.0
PHASE MATCH (DEG)
66057 TA01b
660514f
1
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